Why on God's earth would you put stop leak in a transmission and then install it?
Stop leak is designed to be used if you are going to sell something and you want it to stop leaking in the now. In the long run, stop leak will cause major hemorrhaging of every seal in the transmission. The seals will continue to swell until they turn into goo and disintegrate.
It is meant as a quick fix on cars rolling through auctions and whatnot. Nothing more.
If the transmission is slipping, there is already damage done. No amount of adjustment or stop leak will fix that.
